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P089400 — Coasting (transmission) – mechanical fault

Coasting (transmission) – mechanical fault. The Taycan report this code; below is which control unit sets it on each model and how to read and clear it.

Which models and control units set P089400

Porsche Taycan

Engine Control Module 1

How to read and clear P089400

  1. Plug a standard ENET (Ethernet-to-OBD) cable into your Porsche's OBD port and your Mac or Windows PC.
  2. Open STEUER14, pick your car and run a fault scan: every control unit is read, and P089400 shows with its status, its full description and the freeze frame when the unit stores one.
  3. Fix the cause first, then clear the fault memory and scan again to check it stays away. Reading and clearing fault codes is free on every control unit.

More about fault memory in the manual →

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Other codes of the Engine Control Module 1

P072100Speed sensor, transmission output – signal implausible
P078000Shift monitoring
P07A500Dog clutch – does not separate
P07B600Transmission Park Position Sensor/Switch "A" Circuit, Performance High
P080A00Multi-plate clutch, 2nd gear – adaptation required
P085D00Selector support – malfunction
P091900Selector support - fault
P094900Servo motor (clutches) – adaptation values incorrect
P10F000Release line for starter generator, Open circuit
P10F100Release line for starter generator, Short circuit to B+
P10F200Release line for starter generator, Short circuit to ground
P133500Electric machine speed control - deviation during upshift

All 274 codes of this control unit →

Fault names come from the manufacturer's diagnostic data. STEUER14 is independent and not affiliated with Porsche AG. A code tells you what a control unit detected, not always which part failed — check wiring, supply voltage and related codes before replacing parts. STEUER14 shows each fault's full description, status and freeze frame on the car.